www: redirect alias hostnames (e.g. apex) to canonical origin

Adds www_redirect_hostnames; renders a www-redirect ingress that 301s
to https://<www_hostname>$request_uri while leaving more specific paths
on the same host (e.g. /.well-known/matrix/*) to their own ingresses.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

defaults/main.yml

@@ -15,6 +15,8 @@ www_repo_url: https://git.example.com/organization/www.git
 www_namespace: www
 www_hostname: www.example.com
 www_ingress_class: nginx
+# Extra hostnames 301-redirected to https://{{ www_hostname }} (e.g. [eom.dev]).
+www_redirect_hostnames: []
 www_cluster_issuer: letsencrypt-prod
 # Set to your published website image, including any required metrics exporter.
 www_httpd_image: registry.example.com/organization/www:release